Disazo dyestuffs soluble in water



Patented Feb. 17, 1942 DISAZO DYESTUFFS SOLUBLE IN WATER Erich Fischer, Bad Soden, Taunus, and Richard Huss, Frankfort-on-the-Main, Germany, assignors to General Aniline & Film Corporation, New York, N. Y., a corporation of Delaware No l )rawing. Application November 27, 1940,1Serlal No. 367,378. In Germany July 10, 1939 .5 Claims.

The present invention relates to disazo-dyestuffs soluble in water, more particularly it relates to dyestuffs corresponding with the following general formula:

by the action of phosgene in the presence of an acid binding agent.

The expression group alkylSO3H is intended to include, for instance, substituents of the following composition:

The new dyestufis dye cellulose fibers yellow to orange tints which are distinguished by good properties of fastness, especially by a good capacity for being discharged.

The following examples serve to illustrate the invention, but they are not intended to limit it thereto, the parts being by weight unless otherwise stated; parts by weight are related to parts by volume as the kilo is to the liter:

(1) 18.7 parts of a l-(w-sulfomethyl) 1-aminobenzene (molecular weight: 187) are dissolved in 200 parts by volume of water containing 5.5 parts of calcined sodium carbonate. This solution is run into 25 parts by volume of hydrochloric acid of B. and the mixture is diazotized in the presence of ice by means of 6.9 parts of sodium nitrite, whereupon a part of the diazo-compound separates. When the diazotization is terminated the excess of the nitrite is destroyed. A solution of 20 parts of the hydrochloride of 3-acetaminol-aminobenzene (molecular Weight: 186.5) in 250 parts by volume of water is added to the mass and as the coupling proceeds the mineral acid set free is neutralized by slowly introducing drop by drop into th mixture a sodium acetate solution. By stirring for some time in an acetic acid medium, the coupling is finished. The mono-azodyestuif obtained is filtered with suction and dissolved in dilute sodium carbonate solution. Thereupon phosgene is introduced while rapidly stirring at 30 C.-40 C., until the amino-azo-dyestuff is no longer detectable, care being taken that by addition of sodium carbonate the solution remains always alkaline. The disazo-dyestuff obtained is separated in the usual manner, filtered with suction and dried. It dyes vegetable fibers greenish yellow tints of good properties of fastness. The dyestufi corresponds with the following formula:

NH-C O-OHa When using instead of 4-(w-sulfomethyD-1- aminob'enzene, for instance, 3-(w-sulfomethyl) -1- aminobenzene, 2- (w-sulfomethyl) l-aminobenzene or 4-chloro-3-(w-sulfomethyl) -1-aminobenzene, or instead of 3-acetamino-l-aminobenzene 3-n-propionylamino-l-aminobenzene or 3-acylamino-l-aminobenzenes containing an alkyl group or an alkoxy group in 2-, 5- or 6-position, dyestuffs of similar properties are obtained.

(2) 24.4 parts of 4-(w-sulfopropionylamino) -1- aminobenzene (molecular weight: 244) are dissolved in 200 parts by Volume of water containing the necessary quantity of sodium carbonate. 52 parts by volume of a 2N-sodium nitrite solution are then added and the mixture is slowly introduced, while stirring, into 30 parts by volume of crude hydrochloric acid (20 B.) in the presence of ice. When the diazotization is terminated, the excess of sodium nitrite is destroyed and a solution of 20 parts of the hydrochloride of 3-acetamino-l-aminobenzene (molecular weight: 186.5) in 250 parts by volume of water is added to the diazo-solution. After neutralizing the mineral acid with a sodium acetate solution, the coupling is accomplished by stirring for some time at room temperature in an acetic acid medium. The amino-azo-dyestufi obtained is filt-ered with suction and dissolved in a sodium carbonate solution; into this solution phosgene is introduced, while stirring, at 30 0-40 C. in the presence 'of a small excess of sodium carbonate,

until the transformation into the disazo-dyestufi is terminated. The dyestuff obtained is suitable for dyeing vegetable fibers clear reddish yellow tints. The dyeings are distinguished by very good fastness to light, to wet-processing and an excellent capacity for being discharged. The dyestuff corresponds with the following formulazfi' 1. The water-soluble disazo-dyestuffs of the following general formula:

NHC O-alkyl NH-C O-alkyl wherein R stands for a radical of the benzene series containing as a substituent a member of the group consisting of and X stands for a member of the group consist- NH-CO-CH:

ing of hydrogen, alkyl and alkoxy, being yellow to yellow-brown powders which dissolve in water to a yellow to orange solution and dye cellulose fibers yellow to orange tints which are distin- 60 guish'ed by good properties of fastness, especially by a good capacity for being discharged.

2. The water-soluble disazo-dyestuffs of the following general formula:

1 IHo0oH; NH-C o-om wherein R stands for a radical of the benzene series containing as a substituent a member of the group consisting of being yellow to yellow-brown powders which NH-C O-CH:

dissolve in water to a yellow to orange solution and dye cellulose fibers yellow to orange tints which are distinguished by good properties of fastness, especially by a good capacity for being discharged.

3. The water-soluble disazo-dyestuff of the following formula:

being a yellow powder which dissolves in water to a yellow solution and dyes cellulose fibers greenish yellow tints which are distinguished by good properties of fastness, especially by a good capacity for being discharged.

4. The water-soluble disazo-dyestuff of the following formula:

being an orange powder which dissolves in water to an orange solution and dyes cellulose fibers clear reddish yellow tints which are distinguished by very good fastness to light, to wet-processing and a very good capacity vforbeing discharged.

5. The water-soluble disazo-dyestuff of the following formula:

NH-CO-CHa being a reddish yellow powder which dissolves in water to a yellow solution and dyes cellulose fibers middle yellow tints which are distinguished by very good fastness to light, to wet-processing and a very good capacity for being discharged.

ERICH FISCHER. RICHARD HUSS. 

